package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // TODO 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     * @param employeeDTO
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {

        // 1. 进行对象转换
        Employee employee = new Employee();
        // Spring 自带了拷贝工具，可以进行对象属性的拷贝
        // (对象属性拷贝)BeanUtils.copyProperties(源对象, 目标对象);
        BeanUtils.copyProperties(employeeDTO, employee);

        // 2. 补充一些属性值
        // 2.1 设置账号的状态，默认为启用，启用为1，禁用为0
        employee.setStatus(StatusConstant.ENABLE);
        // 2.2 设置账号的密码
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        // 2.3 设置创建时间和修改时间
        /*employee.setCreateTime(LocalDateTime.now());
        employee.setUpdateTime(LocalDateTime.now());
        // 2.4 设置创建人id和修改人id
        // TODO 后期需要改为当前登录用户的id
        employee.setCreateUser(BaseContext.getCurrentId());
        employee.setUpdateUser(BaseContext.getCurrentId());*/

        // 3. 保存到数据库中
        employeeMapper.insert(employee);
    }

    /**
     * 分页查询员工
     *
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 开启分页
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);

        // 得到当前页数和每页最大页数
        int pageNum = page.getPageNum();
        List<Employee> list = page.getResult();

        return new PageResult(pageNum, list);
    }

    /**
     * 修改员工状态
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        // 方法一
        /*Employee employee = new Employee();
        employee.setStatus(status);
        employee.setId(id);*/

        // 方法二
        // builder()方法
        // 只有给实体类添加了@BUilder注解，才能使用builder()方法
        Employee.builder()
                .status(status)
                .id(id)
                .build();

        employeeMapper.startOrStop(status, id);
    }

    /**
     * 根据id查询员工
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        return employeeMapper.getById(id);
    }

    /**
     * 修改员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        // Spring 自带了拷贝工具，可以进行对象属性的拷贝
        // (对象属性拷贝)BeanUtils.copyProperties(源对象, 目标对象);
        BeanUtils.copyProperties(employeeDTO, employee);

        /*employee.setUpdateTime(LocalDateTime.now());
        employee.setUpdateUser(BaseContext.getCurrentId());*/

        employeeMapper.update(employee);
    }

}
